Fixed blurpy middleware.

misago/core/middleware.py

@@ -4,3 +4,4 @@ from misago.core import threadstore
 class ThreadStoreMiddleware(object):
     def process_response(self, request, response):
         threadstore.clear()
+        return response

misago/core/threadstore.py

@@ -9,8 +9,9 @@ def get(key, default=None):
 
 
 def set(key, value):
-    return _thread_local.__dict__[key] = value
+    _thread_local.__dict__[key] = value
+    return _thread_local.__dict__[key]
 
 
 def clear():
-    _thread_local.__dict__ = {}
+    _thread_local.__dict__.clear()